Overdues

If you add the overdue parameter, you can get a list of patrons with
overdue copies instead of a list of patrons with copies on the hold
shelf. By default, this will give you a list of patrons with copies
that are 14 days overdue. If you’d like to specify a different number
of days you can add the number after the parameter with an equals
sign:

https://your.evergreen-server.tld/phonelist?overdue=21&ws_ou=2

The above will retrieve a list of patrons who have items that are 21
days overdue at the location with ID of 2.

The number of days is an exact lookup. This means that the program
will look only at patrons who have items exactly 14 days or exactly
the number of days specified overdue. It does not pull up any that are
less than or greater than the number of days specified.